OKIPAGE 8W Led Printer
Contents
1. OKI Service Guide OKIPAGE8w Chapter 0 Introduction Front Cover OKIDATA Service Guide ud OKIPAGE 8w LED PAGE PRINTER Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual 05 17 99 Note This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 300 dpi which is ideal for printing but does not display well on most displays Table of Contents Page Service Guide OKIPAGE8w 0 Introduction Preface 1 1 Configuration Configuration 2 1 1 System Configuration 3 1 2 Printer Configuration 4 1 3 Specification 5 1 4 Safety Standards 6 Ate 1 4 1 Certification Label 7 vest 1 4 2 Warning Label 8 2 Operation Description 2 0 Operation Description 9 2 1 Main Control Board 10 2 2 Power Supply Unit 11 2 3 High Voltage Power Supply Board 12 2 4 Electro Photographic Processor 13 2 5 Electro Photographic Process 14 2 9 1 Explanation of Each Process Operation 15 2 6 Paper Jam Detection 16 2 Toner Low Detection 17 2 8 Cover Open 18 2 9 Detecting ID existence 19 3 Parts Replacement Parts Replacements 20 3 1 Precautions for Parts Replacement 21 3 2 Parts Layout 22 re Upper Cover Assy 23 Sate Base Frame Unit 24 ee Base Plate Unit 25 3 3 Replacing Parts 26 Sette 3 3 1 Hopper Plate 27 geg 3 3 2 LED Head and Head Spring 28 ege 3 3 3 Transfer Roller 29 ee 3 3 4 Upper Cover Assy 30 Ee 3 3 5 High Voltage Power Supply Board P22. BPX for any updates to this material http bpx okidata com Page 34 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 8 Side Plate M and Idle Gear Perform parts replacement while making the base frame assy stand so that side plate M will face upward 1 Dismount the upper cover assy See Section 3 3 4 2 Remove two screws 1 and two claws then dismount plate side M 2 3 Dismount earth plate 3 two idle gears P 4 idle gear M 5 idle gear 3R 6 idle gear 2R 7 idle gear heat 8 idle gear R 9 and Gear R 10 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 35 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 9 Heat Assy This section explains how to dismount the heat assy and parts in the assy lt Dismounting the heat assy gt 1 Dismount the upper cover assy See Section 3 3 4 2 Dismount the high voltage power supply board See Section 3 3 5 3 Remove two screws 1 disconnect connector 2 and dismount heat assy 3 lt Dismounting parts in heat assy gt 4 Dismount heat separator 14 5 Remove screw 4 and dismount terminal plate 6 Handle heat assy 3 carefully because Halogen lamp 7 comes off 6 Turn left and right heat bearings 8 in the arrow direction to unlock Then dismount Halogen lam
3. 7 Poor fusing 68 DE 8 Vertical white belt stripe 69 eg Contents Figure 6 4 70 ee Contents Figure 6 5 71 7 Wiring Diagram 7 1 Interconnect Signal Diagram 72 7 2 PCB Layout 73 2 1 Main Control Board HBY PCB 74 2 2 High Voltage Power Supply Board 75 8 Parts List Cover Assy Upper 76 Base Frame Unit 77 Heat Assy 78 Base Plate Unit 79 A Local Printing Local Printing 80 B Parallel Interface Parallel Interface 81 C Maintenance Utility Outline of Maintenance Utility 82 Detail of Each Function 83 4 1 Engine Menu Setting 84 4 2 Engine Counter 85 4 3 Printer Status 86 Table of Contents 4 4 Test Print 4 5 Option 4 6 About 4 7 Reload 4 8 Exit Page 1 OKT Service Guide OKIPAGE8w a Chapter 0 Introduction Preface This Service Handbook describes the field maintenance procedures for the OKIPAGE 8w This manual is written for use by service persons Please note that you should refer to the Printer User s Manual for operating procedures Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 2 Service Guide OKIPAGE8w Chapter 1 Configuration Configuration System Configuration Printer Configuration Specification Safety Standards Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDA
4. List Type of Error Supervisory Reference Value Sensor Paper feed error Electromagnetic 69 clutch ON Paper sensor ON Paper feed jam 1 Paper sensor ON 122 9 Outlet sensor ON Paper size error Paper sensor ON 2 52 64 mm Paper sensor OFF lt 15 77 400 56 mm Paper outlet jam Outlet sensor ON 2 52 64 mm lt L Outlet sensor OFF lt 15 77 400 56 mm Paper feed jam 2 Outlet sensor OFF 121 9 Outlet sensor OFF Unit mm Normal rotation Pulse motor OFF main Reverse rotation l l Electromagnetic OFF clutch ON l I l Manual feed OFF 3 7 Sensor ON OFF Paper sensor i ON l Outlet sensor ie Warm up Paper feed Printing Operation mode lege Timing Chart for Paper Feed Tray Feed Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 17 Service Guide OKIPAGE8w Chapter 2 Operation Description OKI 2 7 Toner Low Detection e Hardware configuration of toner sensor The figure below shows the hardware configuration of the toner sensor Image drum unit Agitation bar iron Magnet Toner sensor lever Hardware Configuration of Toner Sensor e Toner detection method 1 Toner sensor monitoring conditions are shown in the figure below Toner sensor Magnet draw in tl Caution The toner sensor is not monitored when
5. and Eject Roller 3 3 11 Pressure Roller B Back Up Roller 3 3 12 Separator Guide 3 3 13 Pulse Motor Main 3 3 14 Hopping Shaft Assy 3 3 15 Resist Roller 3 3 16 Paper Sensor E Paper Sensor Exit and toner Sensor Assy 3 3 17 Base Plate Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 27 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 1 Hopper Plate 1 Remove two claws and dismount hopper plate 1 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com o Page 28 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 2 LED Head and Head Spring 1 Open top cover assy 1 2 Dismount the left clamp and LED head 2 Then dismount flat cable assy 3 3 Dismount two head springs 4 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 29 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 3 Transfer Roller 1 Open top cover assy 1 and dismount the image drum unit Type 6 2 2 Remove the right claw Then dismount transfer roller 3 two re
6. by the transfer roller When a high negative voltage is applied from the power supply to the transfer roller the positive charge induced on the surface of the transfer roller moves to the paper side at the contact part between the transfer roller and the sheet of paper The positive charge on the lower side of the sheet of paper then causes the negatively charged toner adhering to the surface of the OPC drum to move to the upper side of the sheet This enables transfer to the sheet of paper OPC drum A D s Paper Transfer roller High voltage power supply 7 Fusing The transferred unfused toner image is fused to a sheet of paper because heat and pressure are applied when it passes between the heat roller and back up roller The Teflon coated heat roller contains a 400 W heater Halogen lamp that heats the heat roller The thermistor on the surface of the heat roller keeps the temperature of the heat roller constant A thermostat is also installed for safety If temperature rises abnormally this thermostat opens to suspend voltage supply to the heater The back up roller is pressurized to the heat roller by the pressure spring on each side Thermistor separation claw Heater roller Back up roller Pressure Spring 8 Cleaning After transfer has terminated the cleaning roller temporarily draws in the untransferred residual toner adhering to the OPC drum with static electricity and then returns it to the OP
7. electricity Transfer When paper is placed over the image drum surface the positive charge which is opposite in polarity to that of the toner is applied to the reverse side by the transfer roller The toner is attracted by the positive charge and is transferred onto the paper This results in the transfer of the toner image formed on the image drum onto the paper 5 Cleaning The cleaning roller temporarily attracts the residual toner on the transferred OPC drum with static electricity then returns the toner to the OPC drum 6 Fusing The transferred unfused toner image is fused to a sheet of paper by applying heat and pressure to the image Figure 2 5 shown below is a flow for the electro photographic process yed bupedsjedeg gt Uetpam LONE Un 240 pe 5uddoy ae pas sade jusdoanag IEIGHGn fumes Dun udaa ade y 1asuas Deel enuey JS Ain 18 10 ap OH MA JOSUSS Fade sapt ddns lade __ gt gt gt O HR An O ab Joeueg JANE sa wel ie EI udojaned CO CO upea edeg pala edeg Ayddns EIER r ee JS abueyo Again Jade iddns Jano pesi 31 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 15 OKI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 5 1 Explanation of Each Process Operation 1 Ho
8. the drum is inactive a When the toner low state continues twice Toner Low occurs This state is monitored at a cycle of 40 milliseconds b When the toner full state continues twice Toner Low is released This state is monitored at a cycle of 40 milliseconds c When the toner sensor does not change over two cycles T x 2 the toner sensor alarm state occurs d After the EP unit has been replaced after the drum counter has been reset Toner Low is not detected when the drum counter indicates 1 to 100 counts 2 The basic rotation cycle of the toner sensor is as follows Tire Basic rotation cycle of toner sensor Toner low time t1 gt 0 6 sec Toner full time 0 6 gt t1 gt 0 14 sec Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 18 Service Guide OKIPAGE8w Chapter 2 Operation Description 2 8 Cover Open Opening the stacker cover turns off the microswitch on the high voltage power supply board to suspend 5 V supply to the high voltage power supply This results in the stop of all high voltage outputs At the same time the CVOPN signal is issued to notify the main control board of the switch status and cover open processing is executed Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for a
9. 38 dB A or less 14 Consumables Toner cartridge kit 1 500 5 duty 45g cartridge kit Image drum cartridge 10 000 at continuous printing Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 6 Service Guide OKIPAGE8w Chapter 1 Configuration 1 4 Safety Standards 1 4 1 Certification Label 1 4 2 Warning Label Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 7 Di JI Service Guide OKIPAGE8w Chapter 1 Configuration 1 4 1 Certification Label The safety certification label is affixed to the following location of the OKIPAGE 8w Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Di JI Service Guide OKIPAGE8w Chapter 1 Configuration 1 4 2 Warning Label Warning labels are affixed to the locations that may cause bodily injury During maintenance do work with enough care while following instructions on these warning labels Pin ie Fe A BB mene FOOL ATI dh PLAT A a is A BEER Fer China TAIWAN Copyright 1998 Okidata Division of OKI America Inc All rights reserved See
10. A Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 41 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 15 Resist Roller 1 Dismount the upper cover assy See Section 3 3 4 2 Dismount Idle gear R 3 and Gear R 4 3 Move resist roller 1 to the right and dismount it by lifting Two resist bearings 2 also come off at the same time Take care not to lose them Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com
11. C drum OPC drum Cleaning roller CC RE High voltage power supply Transfer roller Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 16 Di JI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 6 Paper Jam Detection The OKIPAGE 8w monitors the paper status when the power supply is on and during printing In the following cases the OKIPAGE 8w interrupts the printing process as a paper jam Printing can be recovered by opening the cover removing the jammed paper and closing the cover Paper inlet jam Only the manual feed sensor detects Paper exists when the power supply is on The leading part of the paper does not reach the paper sensor although hopping operation was performed three time Paper feed jam The leading part of the paper does not reach the outlet sensor within a fixed time after it has passed the paper sensor Paper outlet jam The trailing part of the paper does not pass the outlet sensor within L mm after the leading part of the paper has passed the outlet sensor 2 52 64 mm lt L lt 15 77 400 6 mm Paper size error The trailing part of the paper does not pass the paper sensor within L mm after the leading part of the paper has passed the paper sensor 2 52 64 mm lt L lt 15 77 400 6 mm Paper Feed Check
12. DATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 39 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 13 Pulse Motor Main Dismount the upper cover assy See Section 3 3 4 Dismount the high voltage power supply board See Section 3 3 5 Dismount side plate M See Section 3 3 8 Dismount the base frame See Section 3 3 12 ae Se Ze Remove two screws 1 and dismount pulse motor main 2 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 40 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 14 Hopping Shaft Assy Dismount the upper cover assy See Section 3 3 4 Dismount the high voltage power supply board See Section 3 3 5 Dismount the base frame See Section 3 3 12 Dismount the paper holder assy See Section 3 3 7 Dismount the sheet guide See Section 3 3 12 Dismount side plate M See Section 3 3 8 oo eS o Raise up roller holder 3 slide hopping shaft assy 1 and dismount roller holder 3 and hopping roller 4 Knock pin 5 also comes off at the same time Take care not to lose it 8 Draw out hopping shaft assy 1 to the right and dismount magnet H 6 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDAT
13. H P6L 31 eee 3 3 6 Top Cover Assy and Flat Cable Assy 32 EE 3 3 7 Paper Holder 33 sane 3 3 8 Side Plate M and Idle Gear 34 ios 3 3 9 Heat Assy 30 e 3 3 10 Drive Shaft E Eject and Eject Roller 36 eech 3 3 11 Pressure Roller B Back Up Roller 37 Senge 3 3 12 Separator Guide 38 E 3 3 13 Pulse Motor Main 39 Sipe 3 3 14 Hopping Shaft Assy 40 eet 3 3 15 Resist Roller 41 en 3 3 16 Paper Sensor E Paper Sensor Exit and Toner 42 Sensor Assy Seca 3 3 17 Base Plate 43 4 Adjustment Table of Contents Page 4 0 Adjustment 44 4 1 Adjustment Types and Functions 45 aera 4 1 1 Printer Driver 46 sees 4 1 2 Engine Maintenance Utility 47 4 2 Adjustment When Replacing a Part 48 ee 4 2 1 Setting LED Head Drive Time 49 EN 4 2 2 Uploading and Downloading EEPROM Data 50 5 Periodical Maintenance 5 1 Periodical Replacement Parts 51 5 2 Cleaning 52 9 2 1 Cleaning the LED Lens Array 93 6 Troubleshooting Procedures 6 1 Troubleshooting Tips 54 6 2 Check Points Before Correcting Image Problems 55 6 3 Notes When Correcting Image Problems 56 6 4 Preparation Before Troubleshooting 57 6 5 Troubleshooting 58 6 5 1 Status Monitor Message List 59 6 5 2 Status Message Troubleshooting 60 6 5 3 Image Troubleshooting 61 aca 1 An image is light or blurred entirely 62 ee 2 Dark background density 63 Se 3 A blank paper is output 64 DEN 4 Vertical black belt stripe 65 sires 5 Cyclic defect 66 rete 6 A blank paper is output 67 Se
14. I Service Guide OKIPAGE8w Chapter 2 Operation Description 2 1 Main Control Board The main control board consists of a one chip CPU a program ROM a DRAM an EEPROM a host interface circuit and a mechanism driving circuit The mechanism driving circuit consists of an LED head a main motor and an electromagnetic clutch 1 One chip CPU The one chip CPU is a custom CPU 8 bit internal bus 8 bit external bus 10 MHz clock incorporating mask ROM and CPU peripheral devices This CPU has the functions listed in the table below Built in Device DRAM controller Controls DRAM DMA controller Transfers image data from Parallel I F to DRAM from DRAM to a video output port and between CPU and DRAM Parallel interface controller Controls the parallel interface Video output port Controls LED head LED STB output port Timer Generates various control timings for monitoring paper feeding and a paper size I O Port Inputs and outputs the sensor signals and motor signals etc Also performs I O for EEPROM A D converter Inputs the feedback signals from a high voltage generation circuit and thermistor signal 2 Program ROM Program ROM contains a program for the equipment EPROM is used as program ROM When mask ROM in the one chip CPU explained in 1 above is valid the EPROM is not mounted For details on short wiring setting see Section 7 2 3 DRAM DRAM is used as resident memory 4 EEPROM EEPROM holds the followi
15. TA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 3 Di JI Service Guide OKIPAGE8w Chapter 1 Configuration 1 1 System Configuration The OKIPAGE 8w consists of a control block a power supply unit and an engine block See Figure 1 1 below ENGINE UNIT Paper Feed Mechanism Electro photographic Processor Main High Voltage 2 Power Supply Board 5 Figure 1 1 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 4 Di JI Service Guide OKIPAGE8w Chapter 1 Configuration 1 2 Printer Configuration The printer unit consists of the following five hardware components Electro Photographic Processor Paper Feeder Main Control Board High Voltage Power Supply Board Power Supply Unit Figure 1 2 is the configuration of the printer unit High voltage Power Supply Board P6L High woltage Power Supply Board P2H Figure 1 2 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com OKI Page 5 Service Guide OKIPAGE8w Chapter 1 Configuration 1 3 Specification 1 Type 2 Outside dimensions excludes protruding portion 3 Weight 4 Development method Exposure met
16. al rotation of pulse motor main Drum roller transfer roller cleaning roller CH roller developing roller heat roller exit roller rotation Reverse rotation of pulse motor main Drum roller transfer roller cleaning roller CH roller developing roller heat roller exit roller feed roller hopping roller rotation Hopping operation from the tray however is performed when the electromagnetic clutch is turned on Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 14 Di JI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 5 Electro Photographic Process 1 Charging The surface of the OPC drum is charged negatively and uniformly by applying the DC voltage to the CH roller Exposure Light emitted from the LED head irradiates the negatively charged surface of the OPC drum The surface potential of the irradiated surface attenuates to form the electrostatic latent image corresponding to the image signal Development and residual toner recovery The negatively charged toner is brought into contact with the OPC drum adhering to the electrostatic latent image on the OPC drum by static electricity This adhesion causes the electrostatic latent image to change to a visible image At the same time the residual toner on the OPC drum is attracted to the developing rollerby static
17. ards do not wear gloves that can generate static electricity 8 Do not place PC boards directly on devices or floors Maintenance Tools Table 3 1 lists the maintenance tools necessary for parts replacement enanas UTC ets cre DE Screwdriver gt Mo 2 100 Philips A ser fete Screwdriver Maintenance Utility Table 3 2 Maintenance Utility w TT CC e ET A Maintenance utility 1 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 22 Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 2 Parts Layout This section explains the layout of main parts Upper Cover Assy Base Frame Unit Base Plate Unit Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 23 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement Upper Cover Assy Spur gear A Guide side L Hopper plate Upper cover Figure 3 1 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 24 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement Base Frame Unit Flat cabl
18. board for each dot line 4 992 LEDs are driven to radiate the image drum 5 Heat Assy The heat Assy consists of a heater a heat roller a thermistor and a thermostat The power supply unit supplies AC voltage to the heater according to the HEATON signal from the main control board to heat the heat roller The main control board monitors the heat roller temperature via the thermistor and keeps the temperature constant by turning on off the heater AC voltage supply If the heat roller temperature rises abnormally the thermostat of the heater voltage supply circuit functions to forcibly suspend the AC voltage supply UO pan St y amp oyeubewo 0s e SUL uays Ce Oe s Jarsoy AP ay wey voejado Buddo uaea Japos Dud ou JSO Dee CH ye Sa yesy ajos Buidofarap aos H9 Leo bumueajo Leo Jaisuen Ya pol Wg Uew ou as nd Jo une SAH E CHE JOU e e ol yesy ajos Duden eyo HO Leo Dumueajo Vay oO asue Ya pol Vr Uew Oo ssd JO UHE ELLO CD UL oau es nd Ag oo Japo Guquud Luut Jajja 6uiddoy 1 ht EE A O es ES tale SIs a de o A o Ey e a a a Io ae 1 1 JOSUBS JOSUSS pay on O Josuas aded O enuey S A A SH D CH gi LU Jala paa l l l l l l l l 4 04 1E8H DATS 531101 Buesa l l l l l l l l l Jo FS an ung att Burdoyanag UELL JO OW as ind JO uwe ELLOU A0 UE aq o Jo CU ue 10704 esd jo vonet asana g USAD aq OAH 2 1 Norm
19. developing roller 520 V O V Voltage to be applied to a sponge roller 400 V 1 3 KV Voltage to be applied to a cleaning roller 500 V 3 5 KV 750 V Voltage to be applied to a transfer roller Caution The TR voltage varies with medium and transfer roller impedance 2 Sensors The high voltage power supply board consists of the high voltage power supply circuit that supplies power to the electro photographic processor system and the photosensor that detects a paper feeding system and toners Figure 2 2 shows the sensor layout drawing Exit roller Qutlet sensor ol Heat roller rl Transfer roller Feed roller Paper sensor Toner sensor e Hopping assy MM roller Manual feed sensor eee mmm Paper feeding direction Slee State bg feed sensor Kee whether paper was inserted into the be Paper exists manual feed sensor section OFF No paper exists Paper sensor Detects the leading part of the paper Monitors ON Paper exists paper feeding OFF No paper exists Output sensor Monitors paper feeding and the paper size ON Paper exists according to the paper sensor arrival and passing OFF No paper exists time Toner sensor Detects the low toner status ON long Toner low OFF short Toner high Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx o
20. e assy Head spring Top cover assy Pressure roller Di Back up roller Paper guide P Transfer roller Paper guide L N Hopper Paper spring holder 1 d Gei CNA lt lt Stopper spring S KZ dee Th gt s5 d side plate M ldle gear heat Tension plate Magnet H hopping shaft High voltage power supply board P2H Pulse motor Mam Sheet guide Power sensor E Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 25 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement Base Plate Unit Power supply unit a e e Main control board E he High Voltage Power Supply board Ka Pa Base plate assy Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Service Guide OKIPAGE8w Chapter 3 Parts Replacement Page 26 3 3 Replacing Parts This section explains how to replace parts and assemblies 3 3 1 Hopper Plate 3 3 2 LED Head and Head Spring 3 3 3 Transfer Roller 3 3 4 Upper Cover Assy 3 3 5 High Voltage Power Supply Board P2H P6L 3 3 6 Top Cover Assy and Flat Cable Assy 3 3 Paper Holder 3 3 8 Side Plate M and Idle Gear 3 3 9 Heat Assy 3 3 10 Drive Shaft E Eject
21. gist bearings 4 and gear T 5 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 30 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 4 Upper Cover Assy Turn off the power switch and unplug the AC cord from the AC socket Disconnect interface cable 1 Open top cover assy 2 and dismount the image drum unit Type 6 3 Move paper guide L 4 and paper guide R 5 on the rear of the printer to the center Remove two front claws of upper cover assy 6 and lift upper cover assy 6 Dismount spur gear A 7 guide slide L 8 and guide slide R 9 Dismount lamp 10 AD p A A MN Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 5 High Voltage Power Supply Board P2H P6L Dismount upper cover assy See Section 3 3 4 Remove three screws 1 and remove the cover 2 and draw out high voltage power supply board 3 Disconnect all the cables 4 from high voltage power supply board 3 and dismount high voltage power supply board 3 Caution Note the following when assembling the high voltage power supply board Mount the high voltage power
22. hod 5 Paper used 6 Printing speed 7 Paper feeding method 8 Paper delivery method 9 Resolution 10 Power input 11 Power consumption 12 Temperature and humidity Desktop Height 5 9 150 mm Width 12 2 310 mm Depth 7 5 191mm 9 3 Ibs 4 2 kg Dry non magnetic development system LED stationary head lt Type gt e Standard paper Xerox 4200 20 lbs e Application paper manual face up feed Label Envelope OHP paper Transparency lt Size gt 14 355 6 mm Max x 8 5 215 9 mm lt Thickness gt Automatic feed 16 to 28 Ibs 60 to 105 g m Manual feed Label Envelope OHP paper transparency First print 23 seconds A4 after warm up Continuous print 8 sheets minute A4 Warm up time 40 seconds 120 VAC for ODA 230 VAC for OEL INT at room temperature 77 F 25 C Automatic paper feed or manual paper feed Face down 600 dpi x 600 dpi true 230 VAC 10 for OEL INT 120 VAC 15 for ODA Peak Approx 450W Typical operation Approx 100W Idle Approx 30W Power save mode Approx 5W Temperature Humidity During operation 10 to 32 C 20 to 80 RH relative humidity In storage 10 to 43 C 10 to 90 RH relative humidity No condensation is permissible Caution Temperature and humidity in storage are measured with the OKIPAGE 8w being packed they are valid for one year 13 Noise During operation 48 dB A or less Standby
23. kidata com Page 13 OKI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 4 Electro Photographic Processor The electro photographic processor prints out the image data to be sent from the main control board on sheets of paper Figure 2 3 shows the layout drawing of the electro photographic processor 1 Image drum unit The image drum unit makes a toner adhere to the formed electrostatic latent image with static electricity This electrostatic latent image is formed by the lights irradiated from LED heads 2 Electromagnetic clutch The electromagnetic clutch controls the rotation of the hopping roller according to signals from the control block Dunuud ABI WW 450 NO Ol JOSUGS paa ITU BI F Buquud enut sas Buiddoy Jago pees 00051 8 Jo asp fen a us one AA oor 2 ELE 000 6 9 Bag IG DE 0006 e Jaa eet 016 61 6 Il yeH EI 3 Pulse motor Main This pulse motor of 48 steps rotation is two phase excited by the signal from the main control board it performs feeding control by switching normal rotation to reverse rotation or vice versa and turning on off the electromagnetic clutch The relationship between the main motor electromagnetic clutch resist gear drum gear hopping roller is shown in the table below and on the subsequent pages Clutch Normal rotation Hopping 4 LED head The shift and latch registers receive image data from the main control
24. ng data e Menu data e Counter value e Adjustment value 5 Parallel interface The parallel interface receives parallel data from the host it conforms to the IEEE1284 specification Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 11 OKI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 2 Power Supply Unit The power supply unit supplies 5 V and 26 V to the main control board according to 230 VAC 120 VAC Output voltage Application Used to generate a logic circuit and a high voltage used to drive the motor and electromagnetic clutch Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 12 Di JI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 3 High Voltage Power Supply Board 1 High Voltage power supply circuit The high voltage power supply circuit generates the following voltages required for the electro photographic processor from 5 V according to the control sequence from the main control board When the cover is open 5 V supply is automatically interrupted to stop high voltage output Voltage Application 1 3 KV Voltage to be applied to charge roller I 265 V 265 V Voltage to be applied to a
25. ny updates to this material http bpx okidata com Page 19 Di JI Service Guide OKIPAGE8w Chapter 2 Operation Description 2 9 Detecting ID existence In this model a micro switch may be activated applying a high voltage to the machine under a state where the cover is slightly opened In this case there is a fear that when a user insert his hand through the opening he may be shocked unless an ID has been installed Safety standard measures EN60950 1992 Therefore with mechanism an interlock system for micro switch shall be added if a machine has no mechanism with ID inside Also for control ID existence detection shall be implemented according to the following method lt Conditions for judging ID existence gt If a toner sensor does not change for 1 2 cycle of toner sensor basic rotation cycle soon after powering on or closing cover no installed ID shall be judged stopping Warming Up motion to shift the machine mode to light malfunction But this error can be recovered by cover open and close operation after installing ID Ttime Remarks __ S OO As the toner sensor monitors at intervals of 40 msec the fractional part should be rounded down ID existence detection time The conditions for enabling this error should be as follows Valid condition In the case of 31 pages or more in total drum counter Invalid condition In the case of 30 pages or less in total drum counter a significant malfunction toner sens
26. or error shall occur But when the toner sensor breaks down with 31 or more counted in total at the drum ID not Install will be displayed without fail at power on Even in this case the machine should be in printable state so that printing can be guaranteed until the completion of toner repair See the drawing below Abnormal toner sensor iher cases waveform ID not Installed POWER ON displayed informed Cover open close Abnormal toner sensor waveform Status_A Stalus_B Normal Normal Abnormal toner sensor waveform Cover open close Cover open close Normal toner sensor waveform Toner Sensor Error di splayed infonmed ON LINE Normal printing Abnarmal toner sensor wavetorm Normal printing Image Drum ID not Installed Toner Sensor Error Specification 1 Toner sensor error ID not Installed state should not be stored in the EEPROM 2 A shift to ID not Installed and Toner Sensor Error shall be made at cover open or close Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 20 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement Parts Replacements This chapter explains how to replace parts assemblies and units in the field The replacement procedures to be explained here include dismounting not mounting When mounting parts assemblies and
27. p 7 heat bearing 8 heat roller 9 and heat gear 13 together Take care not to drop Halogen lamp 7 7 Dismount thermistor 10 8 Dismount the clamp then thermostat 11 heat contact 12 and heat cord 5 together 9 Dismount heat contact 12 and heat cord 5 from thermostat 11 Caution Take care not to bend the claw when dismounting heat bearing 8 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 36 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 10 Drive Shaft E Eject and Eject Roller 1 Dismount the upper cover assy See Section 3 3 4 2 Dismount top cover assy See Section 3 3 6 3 Remove two screws 1 from heat assy Section 3 3 9 life the heat assy and dismount idle gear E A 2 and idle gear E B 3 4 Unlock and dismount drive shaft E Eject 4 Dismount two eject rollers 5 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 37 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 11 Pressure Roller B Back Up Roller Dismount the upper cover assy See Section 3 3 4 Dismount the high voltage power supply board See Section 3 3 5 Dismount
28. pping As shown in the figure below the clutch for hopping is turned on off according to current ON OFF to a coil When the clutch is OFF Spring for resetting Hopping gear Clutch plate DN Nt aah Fara NA e af IDA Magnetic i N ei i substance plate F o Hi NP 4H N al ya Pin ha LE Hopping shafi F Hopping roller DAN Engagement section When the clutch is ON Hopping gear Clutch plate When the clutch is on the hopping gear engages with the clutch plate to rotate the hopping roller When the clutch is off the hopping gear is separated from the clutch plate by the spring for resetting disabling the rotation of the hopping roller 2 Printing and warm up At warm up Triple gear Transfer gear Regist gear Idle gear Planetary gear Hopping gear Gear A Pulse motor main Rotate the pulse motor main in the a direction The planetary gear rotates in the a direction dislocating its position in the a direction This causes the planetary gear to be separated from gear A The hopping gear will not rotate The triple gear and transfer gear rotate via the idle gear to drive the EP unit At printing Triple gear Transfer gear Regist gear aan TS Idle gear TY e eg Planetary gear Hopping gear Gear A Pulse motor main The paper is further advanced in synchronization to the print data 3 Charging Charging i
29. s performed by applying DC voltage to the charge roller that is in contact with the surface of the OPC drum Charge roller OPC drum 4 Exposure Light emitted from the LED head irradiates the negatively charged surface of the OPC drum The surface potential of the irradiated surface attenuates to form the electrostatic latent image corresponding to the image signal LED head h Charge roller EEN OPC drum Paper Image drum 5 Development The electrostatic latent image on the surface of the OPC drum is changed to a visible toner image by applying a toner to it Development is performed in the contact part between the OPC drum and developing roller 1 The sponge roller negatively charges a toner and applies it to the developing roller Developing blade Charge roller Sponge roller Developing roller SCH OPC drum 2 The toner applied to the developing roller is thin coated by the developing blade 3 A toner adheres to the exposure part of the OPC drum in the contact part between the OPC drum and developing roller This causes the electrostatic latent image to be changed to a visible image 6 Transfer The transfer roller is composed of conductive sponge material This roller is set so that the surface of the OPC drum and sheets of paper will adhere closely A sheet of paper is placed on the surface of the OPC drum and the positive charge opposite to the negative charge of a toner is applied from the reverse side
30. supply board with top cover assy removed or open e Take care that cable 4 will not interfere with the paper sensor exit when it is connected Paper sensor axil Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 32 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 6 Top Cover Assy and Flat Cable Assy 1 Dismount the upper cover assy See Section 3 3 4 2 Dismount the LED head See Section 3 3 2 3 Press the left clamp outward and dismount the engagement and top cover assy 1 Tension spring 2 also comes off at the same time 4 Disconnect connector CN6 and dismount flat cable assy 3 connector HEAD Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 33 OKI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 7 Paper Holder Dismount the upper cover assy See Section 3 3 4 Dismount paper holder 1 Unlock and dismount paper guide L 2 and paper guide R 3 Remove the claw and dismount hopper spring 4 mw e SY Ss Remove the claw and dismount stopper spring 5 Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange
31. the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 8 Page 9 Service Guide OKIPAGE8w Chapter 2 Operation Description 2 0 Operation Description The OKIPAGE 8w consists of a main control board a high voltage power supply board a power supply unit and an electro photographic processor The OKIPAGE 8w receives print data from a higher level interface and sequentially stores it in memory The OKIPAGE 8w decodes and edits the received data while storing print data from the interface in memory It sequentially transfers the edited data to the LED head for each dot line The electro photographic processor then prints the data on sheets of paper The display of the higher level host is used for device operation and status display Figure 2 1 is the block diagram of the OKIPAGE 8w pun Adang amog lun emod A EJOA yb Wu EMOJ abeyo yBIH G IOAIH TOAIH HMC WECUOCHT EA Lal JE peas rrZOH rrZOH dAQ AQ ASTAe STOd GINS WOH YSE HW WHO SL x AL Wood eng Gett ot x sng epg p BEEd 510 E MN 93d WRN UI EI Mad d rYog Wyo ddyo NOILdO UL JO a NOyd33 ISA ICCN ae GQvWSH 03111 YS9NMd JOIO UIEN Figure 2 1 Block Diagram Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 10 Di J
32. the heat assy Section 3 3 9 oo poz Dismount the engagement with the left ground then pressure roller B 1 Two bearing BUs 2 and two bias springs 3 also come off at the same time Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 38 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 3 12 Separator Guide 1 Dismount the upper cover assy See Section 3 3 4 2 Dismount the high voltage power supply board See Section 3 3 5 3 Remove four screws 1 4 Dismount inlet 2 from base frame 3 lt Dismounting inlet 2 gt Insert a screwdriver into the hole on the side of base frame 3 remove the inlet claw from base frame 8 and dismount inlet 2 5 Disconnect three cables 4 and connector 11 and dismount base frame 3 Then remove screw 10 lt Disconnecting connector 11 12 gt Dismount connector 11 by drawing it upward while pushing the clamp lever with a standard screwdriver 6 Dismount the paper holder assy See Section 3 3 7 7 Dismount two engagements and sheet guide 5 8 Dismount friction pad 6 compression spring S 7 and separator guide 8 9 Dismount paper sensor E 9 Disconnecting Connector Screw driver cf lover Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKI
33. units reverse the dismounting steps 3 1 Precautions for Parts Replacement 3 2 Parts Layout 3 3 Replacing Parts Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 21 Di JI Service Guide OKIPAGE8w Chapter 3 Parts Replacement 3 1 Precautions for Parts Replacement 1 Be sure to disconnect the AC cord and interface cable before replacing parts a Be sure to disconnect the AC cord in the following procedures i Turn off the POWER switch 0 11 Disconnect the AC plug from the power outlet iii Disconnect the AC cord and interface cable from the printer b Be sure to reconnect the printer using the following procedures i Connect the AC cord and interface cable to the printer li Connect the AC cord to the power outlet iii Turn on the printer s POWER switch Disconmecting 2 Do not disassemble parts as long as the printer is operating normally 3 Minimize disassembling Only the parts indicated in the parts replacement procedures can be disassembled 4 Use only the specified maintenance tools 5 Disassemble parts in the specified sequence otherwise parts may be damaged 6 Temporarily tighten small parts such as screws and collars to the original locations because they tend to be lost easily 7 When handling ICs such as CPUs ROM and RAM and PC bo
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